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176
METALLURGY OP IRON AND STEEL.
is small; with the closed'oven the heat required is less, a smaller amount of combustible suffices and the only loss in weight is the volatile part. Thus, with a rich coal, the yield of coke is the
SECTION E-E SECTION D-D          n ,  n   T>           SECTION F-F
CROSS SECTION
LONGITUDINAL 8.ECTI.ON
FIG. IX-B.—SEMET-SOLVAY COKE OVEN.